2023 consecutive composite numbers follow the prime 4840766810958801623463585118756371445427. It is believed to be the first known occurrence of a gap between primes which is greater than or equal to 2000.
2023 is deficient because the sum of its proper divisors (1, 7, 17, 119, 289) is 433 which is less than 2023.
2023 is a Harshad number because it is divisible by the sum of its digits: 2023/(2+0+2+3) = 289
If you add 2023 to its reversal (3202) you get a palindrome (5225).
A 4x4 square can be tiled in 2023 ways with L-shaped trominos and monominos. Here is a picture!
2023 = (2 + 0 + 2 + 3)(2^2 + 0^2 + 2^2 + 3^2)^2